Equipment for treating sewage by biological oxidation

Abstract

An equipment for treating sewage, comprises a horizontal plate with a water sinking hole dividing the equipment into two portions: an upper portion of biofilter and a lower portion of contact oxidation pond. Within such equipment, a two-stage sewage biochemical treatment is accomplished. The equipment of the present invention has the advantages of less land occupation, less energy consumption, higher pollutant removing rate, higher shock resistance, easy management, no excess sewage and waste gas being drained off and less secondary pollution.

What we claimed is: 
     
       1. An apparatus for treating sewage by biological oxidation, comprising: outside walls;   an upper portion of said apparatus;   a lower portion of said apparatus, said lower portion including a contact oxidation pond;   a sewage inlet pipeline and a flushing water pipeline, each of which are disposed on the upper portion of the apparatus;   a water outlet pipeline disposed on the lower portion of the apparatus, said water outlet pipeline defining a means for exiting water and treated sewage introduced through the sewage inlet pipeline and the flushing water pipeline;   an air inlet pipeline disposed on the lower portion of the apparatus;   and an air out pipeline disposed on the upper portion of the apparatus, said air out pipeline defining a means for exiting air introduced through the air inlet pipeline;   a horizontal water collecting plate, said plate having a water sinking hole at one end thereof, and is arranged between said upper portion and said lower portion;   a screening plate disposed above and substantially parallel to said water collecting plate;   a biofilter disposed above said screening plate in said upper portion, said biofilter being charged with fillings; and   a plurality of baffle walls disposed in the contact oxidation pond;   wherein said contact oxidation pond is charged with fillings.   
     
     
       2. The apparatus of claim 1, wherein the fillings in the contact oxidation pond are ceramic flexible fillings. 
     
     
       3. The apparatus of claim 1, wherein the outside walls, the screening plate, the water collecting plate, and the baffle walls are made of armored concrete. 
     
     
       4. The apparatus of claim 1, wherein the outside walls are made of armored concrete. 
     
     
       5. The apparatus of claim 1, wherein the screening plate is made of armored concrete. 
     
     
       6. The apparatus of claim 1, wherein the water collecting plate is made of armored concrete. 
     
     
       7. The apparatus of claim 1, wherein the baffle walls are made of armored concrete. 
     
     
       8. The apparatus of claim 1, wherein the water sinking hole and the water outlet pipeline are disposed on opposite sides of said lower portion. 
     
     
       9. The apparatus of claim 1, wherein the fillings in the biofilter are ceramic flexible fillings. 
     
     
       10. The apparatus of claim 9, wherein the fillings in the contact oxidation pond are ceramic flexible fillings. 
     
     
       11. The apparatus of claim 10, wherein the outside walls, the screening plate, the water collecting plate, and the baffle walls are made of armored concrete.